Reproductive Pathology — MCQs

A 17-year-old pregnant girl in her 4th month of gestation presents with vaginal bleeding and passage of grapelike tissue fragments. Plasma human chorionic gonadotropin (hCG) is very high. Following ultrasound evaluation, dilatation and curettage is performed. Histologic examination shows diffuse trophoblastic proliferation and edema in all chorionic villi. Cytogenetic studies demonstrate a 46, XY karyotype. What is the approximate rate at which this condition progresses to choriocarcinoma?

Q95Medium

Which of the following is NOT a prognostic factor of breast carcinoma?

Q96Easy

What is the most common type of breast carcinoma?

Q97Medium

The type of mammary ductal carcinoma in situ (DCIS) most likely to result in a palpable abnormality in the breast is:

Q98Medium

Which of the following is true about a complete mole?

Q99Easy

All of the following ovarian tumours arise from surface epithelium EXCEPT?

Q100Medium

A 27-year-old woman in the third trimester of her third pregnancy discovers a lump in her left breast. On physical examination, a 2-cm, discrete, freely movable mass beneath the nipple is palpable. After the birth of a term infant, the mass appears to decrease in size. The infant is breastfed without difficulty. What is the most likely diagnosis?

Reproductive Pathology Indian Medical PG Practice Questions and MCQs

Question 91: In a hydatidiform mole, blood cells do NOT develop due to a defect in which germ layer?

A. Primary ectoderm
B. Mesoderm (Correct Answer)
C. Endoderm
D. Trophoblast

Explanation: ### Explanation In a hydatidiform mole, the characteristic histological finding is the presence of avascular, edematous (hydropic) villi. The correct answer is **Mesoderm** because the fetal blood vessels and blood cells within placental villi are derived from the **extraembryonic mesoderm**. [3] **Why Mesoderm is correct:** During normal placental development, the extraembryonic mesoderm invades the primary villi to form secondary and tertiary villi. This mesodermal core is responsible for angiogenesis (vessel formation) and hematopoiesis (blood cell formation). In a hydatidiform mole—particularly a **Complete Mole**—there is a failure or defect in the differentiation of this mesodermal core. [1], [2] Consequently, fetal vessels do not form, leading to a lack of blood cells and the accumulation of fluid within the villi (hydrops), as there is no circulatory system to drain it. [2] **Analysis of Incorrect Options:** * **A. Primary ectoderm:** This layer gives rise to the nervous system and epidermis; it is not involved in placental vasculogenesis. * **C. Endoderm:** This layer forms the epithelial lining of the gastrointestinal and respiratory tracts; it does not contribute to the vascular structure of the villi. * **D. Trophoblast:** While trophoblastic proliferation (cytotrophoblast and syncytiotrophoblast) is a hallmark of molar pregnancies, the trophoblast forms the outer lining of the villi, not the internal blood cells or vessels. [2] **High-Yield NEET-PG Pearls:** * **Complete Mole:** 46,XX (usually); paternal origin (empty egg); **no fetal parts**; diffuse hydropic villi; high risk of Choriocarcinoma. [1] * **Partial Mole:** 69,XXY (triploid); maternal and paternal origin; **fetal parts present**; focal hydropic villi; low risk of malignancy. [1] * **Histology Tip:** The absence of fetal blood cells in villi is a key diagnostic feature of a Complete Hydatidiform Mole. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, p. 1044. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1043-1044. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1039-1040.

Question 92: What is the first gene to be knocked out in the carcinogenesis of the endometrium?

A. PI3KCA
B. PTEN (Correct Answer)
C. KRAS
D. p53

Explanation: The development of **Endometrioid Endometrial Carcinoma** (Type I) follows a well-defined stepwise progression from endometrial hyperplasia to malignancy [1]. **Why PTEN is the correct answer:** The **PTEN** (Phosphatase and Tensin homolog) gene is a tumor suppressor that normally inhibits the PI3K/AKT signaling pathway. It is the **earliest and most common genetic alteration** in the carcinogenesis of the endometrium [1]. PTEN mutations are found in approximately 30–80% of endometrioid carcinomas and, crucially, are also present in about 20% of cases of **benign endometrial hyperplasia**. This indicates that PTEN inactivation is the "initiating event" or the first "hit" that triggers uncontrolled cellular proliferation [1]. **Analysis of Incorrect Options:** * **PI3KCA:** Mutations in this gene also activate the PI3K/AKT pathway, but they typically occur **later** in the progression or concurrently with PTEN mutations, rather than as the initiating event. * **KRAS:** This is an oncogene mutation found in about 15–30% of cases. While it occurs early, it is less frequent and usually follows PTEN inactivation. * **p53:** Mutations in the *TP53* gene are the hallmark of **Type II (Serous) Endometrial Carcinoma**. In Type I (Endometrioid), p53 mutations are a very late event associated with high-grade transformation [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Type I Endometrial Cancer:** Associated with estrogen excess, PTEN mutations, and a favorable prognosis [1]. * **Type II Endometrial Cancer:** Associated with endometrial atrophy, p53 mutations, and a poor prognosis [2]. * **Cowden Syndrome:** A germline mutation in PTEN that leads to multiple hamartomas and a significantly increased risk of endometrial cancer. * **Microsatellite Instability (MSI):** Also seen in Type I cancers due to defects in DNA mismatch repair genes (MLH1). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1016-1020. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1021-1022.

Question 93: Which of the following tumors contains the characteristic 'Schiller-Duval bodies'?

A. Choriocarcinoma
B. Yolk sac tumor (Correct Answer)
C. Granulosa cell tumor
D. Arrhenoblastoma

Explanation: **Explanation:** **1. Why Yolk Sac Tumor is correct:** Yolk sac tumor (also known as Endodermal Sinus Tumor) is the most common germ cell tumor in children. Its hallmark histological feature is the **Schiller-Duval body**. This structure consists of a central capillary surrounded by a layer of neoplastic cells, situated within a space that is also lined by tumor cells [1]. This arrangement mimics a primitive glomerulus (glomeruloid-like structure). Another key diagnostic marker for this tumor is the elevation of **Alpha-fetoprotein (AFP)** [1]. **2. Why other options are incorrect:** * **Choriocarcinoma:** Characterized by the proliferation of cytotrophoblasts and syncytiotrophoblasts without villi [2]. It typically presents with high levels of **hCG** and early hematogenous spread to the lungs [2]. * **Granulosa cell tumor:** A sex cord-stromal tumor characterized by **Call-Exner bodies** (small follicles filled with eosinophilic material) and "coffee-bean" nuclei. It often secretes estrogen. * **Arrhenoblastoma (Sertoli-Leydig cell tumor):** A sex cord-stromal tumor that typically causes virilization due to androgen production. It is characterized by tubules lined by Sertoli cells and nests of Leydig cells containing **Reinke crystals**. **3. NEET-PG High-Yield Pearls:** * **Schiller-Duval bodies** = Yolk Sac Tumor (Endodermal Sinus Tumor). * **Call-Exner bodies** = Granulosa Cell Tumor. * **Reinke crystals** = Leydig cell tumors. * **Psammoma bodies** = Serous Cystadenocarcinoma of the ovary. * **Hobnail cells** = Clear cell carcinoma of the ovary. * **AFP** is the specific tumor marker for Yolk Sac Tumor; **LDH** is for Dysgerminoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 979-980. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1035-1036.

Question 94: A 17-year-old pregnant girl in her 4th month of gestation presents with vaginal bleeding and passage of grapelike tissue fragments. Plasma human chorionic gonadotropin (hCG) is very high. Following ultrasound evaluation, dilatation and curettage is performed. Histologic examination shows diffuse trophoblastic proliferation and edema in all chorionic villi. Cytogenetic studies demonstrate a 46, XY karyotype. What is the approximate rate at which this condition progresses to choriocarcinoma?

A. 0.20%
B. 2% (Correct Answer)
C. 20%
D. 50%

Explanation: **Explanation:** The clinical presentation (grapelike tissue, high hCG) and histologic findings (diffuse trophoblastic proliferation and edema in all villi) are diagnostic of a **Complete Hydatidiform Mole (CHM)** [1]. The 46, XY karyotype confirms this, as CHMs are diploid (usually 46, XX or 46, XY) and entirely paternal in origin (androgenetic) [2]. **1. Why the Correct Answer (B) is Right:** While a Complete Mole is a benign gestational trophoblastic disease, it carries a risk of malignant transformation. Approximately **2%** of patients with a Complete Hydatidiform Mole will progress to **Choriocarcinoma** [1]. It is important to distinguish this from the risk of *Persistent/Invasive Mole*, which is much higher [2]. **2. Analysis of Incorrect Options:** * **Option A (0.20%):** This is too low for a Complete Mole. However, it is the approximate risk of a **Partial Mole** progressing to choriocarcinoma (which is extremely rare) [2]. * **Option C (20%):** This is the risk of a Complete Mole progressing to **Gestational Trophoblastic Neoplasia (GTN)** in general, which primarily includes **Invasive Moles** (15%) rather than choriocarcinoma specifically [1]. * **Option D (50%):** This represents the background of choriocarcinoma cases; approximately 50% of all choriocarcimomas arise *following* a complete mole (the rest follow abortions, normal pregnancies, or ectopic pregnancies). **Clinical Pearls for NEET-PG:** * **Genetics:** Complete Mole = 46, XX/XY (all paternal); Partial Mole = Triploid (69, XXY) (maternal + paternal) [2]. * **p57 Expression:** Complete Moles are **p57 negative** (due to lack of maternal genome), whereas Partial Moles are p57 positive. * **HCG Levels:** Significantly higher in Complete Moles compared to Partial Moles [1]. * **Fetal Parts:** Absent in Complete Moles; may be present in Partial Moles. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1044-1046. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, p. 1044.

Question 95: Which of the following is NOT a prognostic factor of breast carcinoma?

A. Erb B2
B. Estrogen receptor status
C. Progesterone receptor status
D. E-cadherin expression (Correct Answer)

Explanation: ### Explanation In breast pathology, it is crucial to distinguish between **prognostic factors** (which predict the overall outcome or survival of the patient) and **predictive factors** (which predict the response to a specific therapy). **Why E-cadherin is the Correct Answer:** E-cadherin is a cell-cell adhesion molecule. Its loss of expression is a **diagnostic marker** used to differentiate between **Infiltrating Ductal Carcinoma (E-cadherin positive)** and **Infiltrating Lobular Carcinoma (E-cadherin negative)** [3]. While it helps in histological classification, it is not used as an independent prognostic factor to determine the patient's clinical outcome or survival rate. **Analysis of Incorrect Options:** * **Erb B2 (HER2/neu):** This is both a prognostic and predictive factor. Overexpression indicates a more aggressive tumor (poor prognosis) but also predicts a positive response to Trastuzumab (Herceptin) [2]. * **Estrogen (ER) and Progesterone (PR) Receptor Status:** These are vital prognostic and predictive factors [1]. ER/PR positivity generally indicates a better prognosis (well-differentiated tumors) and predicts a favorable response to hormonal therapies like Tamoxifen [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Most important prognostic factor:** Lymph node involvement (Axillary status) [4]. * **Second most important prognostic factor:** Tumor size [5]. * **Nottingham Grading System (Scarff-Bloom-Richardson):** Based on Tubule formation, Nuclear pleomorphism, and Mitotic count [1]. * **Triple Negative Breast Cancer (TNBC):** Lacks ER, PR, and HER2; carries the worst prognosis among molecular subtypes [2]. * **E-cadherin mutation:** Associated with Hereditary Diffuse Gastric Cancer and Lobular Carcinoma of the breast [3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 458-459. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1064-1066. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1068-1069. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1070-1072. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1072.

Question 96: What is the most common type of breast carcinoma?

A. Papillary carcinoma
B. Paget's disease
C. Fibrosarcoma
D. Infiltrative ductal carcinoma (Correct Answer)

Explanation: **Infiltrating Ductal Carcinoma (IDC)**, also known as Invasive Breast Carcinoma of No Special Type (NST) [1], is the most common histological type of breast cancer, accounting for approximately **70–80%** of all invasive cases [3]. It originates in the milk ducts but breaks through the basement membrane to invade the surrounding stroma [1]. Macroscopically, it typically presents as a hard, "gritty" mass due to significant **desmoplasia** (dense reactive fibrosis). ### **Analysis of Options:** * **A. Papillary Carcinoma:** This is a rare subtype (less than 1–2% of cases), more common in older women. It has a better prognosis than IDC but is far from the most common. * **B. Paget’s Disease:** This is not a distinct histological type of carcinoma but rather a clinical manifestation where malignant cells (Paget cells) migrate to the nipple epidermis [4]. It is almost always associated with an underlying DCIS or invasive carcinoma [4], [5]. * **C. Fibrosarcoma:** This is a malignant tumor of mesenchymal (connective tissue) origin. Primary sarcomas of the breast are extremely rare, representing less than 1% of all breast malignancies. ### **NEET-PG High-Yield Pearls:** * **Most common benign tumor of the breast:** Fibroadenoma. * **Most common site for breast cancer:** Upper Outer Quadrant (UOQ). * **Molecular Subtypes:** Luminal A (ER/PR positive, HER2 negative) is the most common molecular subtype and carries the best prognosis. * **Staging:** The most important prognostic factor for breast cancer is the **axillary lymph node status** [5]. * **E-cadherin expression:** IDC typically expresses E-cadherin, whereas **Invasive Lobular Carcinoma** (the second most common type) shows a loss of E-cadherin due to mutations in the *CDH1* gene [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1060-1061. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1068-1069. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1064. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1061-1062. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 456-457.

Question 97: The type of mammary ductal carcinoma in situ (DCIS) most likely to result in a palpable abnormality in the breast is:

A. Apocrine DCIS
B. Neuroendocrine DCIS
C. Well differentiated DCIS
D. Comedo DCIS (Correct Answer)

Explanation: **Explanation:** **Comedo DCIS** is the most aggressive subtype of ductal carcinoma in situ [1]. It is characterized by two distinct histological features: high-grade nuclei and **extensive central necrosis** [2]. This necrotic debris often undergoes **dystrophic calcification**, which is frequently detected as "clustered microcalcifications" on mammography [1]. The accumulation of necrotic material and the associated periductal inflammatory response/fibrosis create a firm, cord-like consistency. This makes Comedo DCIS the subtype most likely to present as a **palpable mass** or a vague area of thickening, unlike other DCIS types which are typically occult. **Analysis of Incorrect Options:** * **Apocrine DCIS:** Characterized by cells with abundant granular eosinophilic cytoplasm. While it can be high-grade, it does not typically form the large, necrotic plugs seen in the comedo type that lead to palpability. * **Neuroendocrine DCIS:** A rare variant where cells express neuroendocrine markers (e.g., chromogranin). It usually presents as an incidental finding or on imaging rather than a palpable mass. * **Well-differentiated (Low-grade) DCIS:** These include patterns like cribriform or micropapillary [1]. They lack significant necrosis and pleomorphism, making them much less likely to produce a physical mass; they are almost exclusively detected via screening mammography [2]. **High-Yield Pearls for NEET-PG:** * **Comedonecrosis:** The hallmark of high-grade DCIS [1]. * **Mammography:** The most common presentation of DCIS is microcalcifications (linear or branching) [1]. * **Paget Disease of the Nipple:** Frequently associated with an underlying DCIS (often the Comedo subtype). * **E-cadherin:** DCIS is E-cadherin positive (distinguishes it from Lobular Carcinoma in Situ, which is E-cadherin negative). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1060-1064. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 452-453.

Question 98: Which of the following is true about a complete mole?

A. Karyotype is 69,XXY
B. hCG levels are < 100,000 mIU/mL
C. Marked trophoblast atypia (Correct Answer)
D. p57KIP2 immunostaining is positive

Explanation: **Explanation:** Hydatidiform moles are part of a spectrum of Gestational Trophoblastic Diseases. Understanding the distinction between Complete and Partial moles is a high-yield topic for NEET-PG. **Why Option C is Correct:** In a **Complete Mole**, there is a total lack of fetal tissue and generalized hydropic swelling of villi. Microscopically, it is characterized by **marked, circumferential trophoblastic proliferation** (both syncytiotrophoblast and cytotrophoblast) and significant **trophoblastic atypia** [1]. This exuberant growth is the reason for the significantly higher risk of progression to choriocarcinoma compared to partial moles [1]. **Why Other Options are Incorrect:** * **Option A:** A karyotype of **69,XXY** (triploidy) is characteristic of a **Partial Mole**. Complete moles are diploid (**46,XX** in 90% of cases), resulting from the fertilization of an "empty" egg by one or two sperm (androgenetic) [1]. * **Option B:** In complete moles, **hCG levels are typically > 100,000 mIU/mL**, often much higher than in normal pregnancy or partial moles, leading to clinical features like hyperemesis gravidarum and theca lutein cysts [1]. * **Option D:** **p57KIP2** is a paternally silenced, maternally expressed gene. Since a complete mole lacks a maternal genome, it is **p57 negative** (absent staining). Partial moles, which contain maternal DNA, are p57 positive. **NEET-PG High-Yield Pearls:** * **Snowstorm appearance** on ultrasound is the classic sign of a complete mole [1]. * **Risk of Choriocarcinoma:** 2-3% for complete moles; rare for partial moles [1]. * **Management:** Suction curettage followed by serial hCG monitoring to ensure levels return to zero [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1044-1046.

Question 99: All of the following ovarian tumours arise from surface epithelium EXCEPT?

A. Mucinous cystadenoma
B. Endometrial carcinoma
C. Brenner tumour
D. Benign cystic teratoma (Correct Answer)

Explanation: Ovarian tumors are classified based on their cell of origin into three main categories: **Surface Epithelial-Stromal tumors**, **Germ Cell tumors**, and **Sex Cord-Stromal tumors**. **1. Why Option D is Correct:** **Benign Cystic Teratoma** (Dermoid cyst) is the most common **Germ Cell tumor** of the ovary [1]. It arises from totipotent germ cells that undergo differentiation into tissues derived from all three embryonic layers (ectoderm, mesoderm, and endoderm) [2]. Since it originates from germ cells rather than the ovarian surface epithelium, it is the correct "EXCEPT" answer. **2. Why the Other Options are Incorrect:** * **Mucinous Cystadenoma (A):** This is a common **Surface Epithelial tumor** characterized by multiloculated cysts lined by mucus-secreting cells resembling endocervical or intestinal epithelium. * **Endometrioid Carcinoma (B):** This is a malignant **Surface Epithelial tumor** that histologically resembles endometrial glands [3]. It is frequently associated with pre-existing endometriosis. * **Brenner Tumour (C):** This is an uncommon **Surface Epithelial tumor** composed of "Walthard cell nests" (transitional epithelium resembling the bladder) [4]. Despite its solid appearance, its origin is epithelial. **High-Yield Clinical Pearls for NEET-PG:** * **Surface Epithelial Tumors:** Most common type of ovarian tumor overall (65–70%). They include Serous, Mucinous, Endometrioid, Clear cell, and Brenner tumors. * **Psammoma bodies:** Classically seen in Serous Cystadenocarcinoma. * **Tumor Marker:** **CA-125** is the marker for surface epithelial tumors (useful for monitoring, not screening). * **Struma Ovarii:** A specialized teratoma composed entirely of mature thyroid tissue, which can lead to hyperthyroidism [2]. * **Call-Exner Bodies:** Pathognomonic for Granulosa Cell Tumors (Sex cord-stromal origin). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 480-481. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1033-1034. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, p. 1032. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1032-1033.

Question 100: A 27-year-old woman in the third trimester of her third pregnancy discovers a lump in her left breast. On physical examination, a 2-cm, discrete, freely movable mass beneath the nipple is palpable. After the birth of a term infant, the mass appears to decrease in size. The infant is breastfed without difficulty. What is the most likely diagnosis?

A. Fibroadenoma (Correct Answer)
B. Intraductal papilloma
C. Lobular carcinoma in situ
D. Medullary carcinoma

Explanation: The clinical presentation of a **discrete, freely movable, non-tender mass** in a young woman is the classic description of a **Fibroadenoma**, often referred to as a "breast mouse" due to its high mobility [1]. **Why Fibroadenoma is correct:** Fibroadenomas are benign fibroepithelial tumors that are **hormonally responsive**. During pregnancy (especially the third trimester), rising levels of estrogen and progesterone can cause these tumors to enlarge or become more prominent [2]. Postpartum, as hormone levels shift or stabilize, the mass often appears to decrease in size or regress. The location (subareolar/beneath the nipple) and the patient's age (27) are highly consistent with this diagnosis. **Why other options are incorrect:** * **Intraductal papilloma:** Typically presents with **serous or bloody nipple discharge** and is usually too small to be felt as a discrete 2-cm movable mass. * **Lobular carcinoma in situ (LCIS):** Usually an incidental finding on biopsy; it does not typically present as a palpable, discrete mass and is rare in this age group. * **Medullary carcinoma:** While it can present as a circumscribed mass in younger women, it is a malignant subtype of invasive ductal carcinoma. It would not decrease in size postpartum and usually lacks the "freely movable" characteristic of a fibroadenoma. **NEET-PG High-Yield Pearls:** * **Most common** benign tumor of the female breast. * **Histology:** Shows a dual population of cells—stromal cells and epithelial-lined glands [1]. Patterns include **intracanalicular** (compressed ducts) and **pericanalicular** (patent ducts). * **Stroma:** The stromal component is the neoplastic element. * **Management:** In young patients, clinical follow-up or FNA/USG is preferred; they carry a very low risk of malignant transformation unless they are "complex fibroadenomas." **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 448-449. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 442-443.

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Diseases of Male Genital Tract

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Endometrial Pathology

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Gestational Trophoblastic Disease

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